78340356 has 18 divisors (see below), whose sum is σ = 198027102. Its totient is φ = 26113440.

The previous prime is 78340351. The next prime is 78340357. The reversal of 78340356 is 65304387.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76737600 + 1602756 = 8760^2 + 1266^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78340356² = 12274422756413472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2176121 = 78340356 / (7 + 8 + 3 + 4 + 0 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 78340356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78340351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1088025 + ... + 1088096.

Almost surely, 2^78340356 is an apocalyptic number.

It is an amenable number.

78340356 is an abundant number, since it is smaller than the sum of its proper divisors (119686746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78340356 is a wasteful number, since it uses less digits than its factorization.

78340356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176131 (or 2176126 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 78340356 is about 8851.0087560684. The cubic root of 78340356 is about 427.8864301109.

The spelling of 78340356 in words is "seventy-eight million, three hundred forty thousand, three hundred fifty-six".